Open Command Prompt as Administrator and run:
copy C:\Windows\System32\termsrv.dll C:\Windows\System32\termsrv.dll.backup
takeown /f C:\Windows\System32\termsrv.dll
icacls C:\Windows\System32\termsrv.dll /grant administrators:F
Modified DLLs break security baselines:
Top Safety Practice: Run the patched server in an isolated VLAN with no internet access and no sensitive data. universal termsrvdll patch windows server 2012 r2 top
This guide explains what a universal termsrv.dll patch is, why administrators use it on Windows Server 2012 R2, the risks and legal considerations, and concise, actionable steps to apply and verify a patch that enables multiple concurrent Remote Desktop (RDP) sessions. Open Command Prompt as Administrator and run: copy
Run licmgr.exe and reset the grace period up to 3 times using: Modified DLLs break security baselines:
wmic /namespace:\\root\cimv2\terminalservices path win32_terminalservicesetting where (__CLASS != "") call addlicenseserverregistered "SERVERNAME"
This buys you another 120 days.